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The conjugate of a quaternion a=a_1+a_2i+a_3j+a_4k is defined by a^_=a_1-a_2i-a_3j-a_4k.

A shift in phase.

A system of equations is any set of simultaneous equations.

If A is true unless B, then not-B implies A, but B does not necessarily imply not-A.

A stereogram made of two pictures, one red and one blue, taken from offset positions. When the pictures are viewed through glasses with one lens of each color, the picture ...

A hyperbolic linear map R^n->R^n with integer entries in the transformation matrix and determinant +/-1 is an Anosov diffeomorphism of the n-torus, called an Anosov ...

An anyon is a projective representation of a Lie group.

Araya and Wiener (2011) found the two cubic planar hypohamiltonian graphs on 70 and 88 vertices, respectively, illustrated above.

All curves of constant width of width w have the same perimeter piw.

The set of points in the space of system variables such that initial conditions chosen in this set dynamically evolve to a particular attractor.